'Attention seeker' Zaky Mallah back in Australia after being detained in Singapore

Former terror suspect and convicted criminal Zaky Mallah has arrived back in Australia after he was detained when flying into Singapore.

The 34-year-old was denied entry into the country “on account of his terrorism-relation antecedents,” a spokesperson from Singapore’s Ministry of Home Affairs office told 9NEWS.

He was deemed a security threat ahead of next week's summit between US President Donald Trump and North Korean leader Kim Jong-un.

Former terror suspect and convicted criminal Zaky Mallah has arrived back in Australia after he was detained after flying to Singapore. (9NEWS) (9news)The 34-year-old was denied entry into the country “on account of his terrorism-relation antecedents. (9NEWS) (9news)

The spokesperson said he arrived at Changi Airport on Wednesday and was sent on the next available flight back to Australia.

He told reporters in Sydney he was “happy to be home”.

Mallah was the first person to be charged under new anti-terror laws in Australia in 2003 for allegedly planning a suicide attack on ASIO and DFAT.

He told reporters he was 'happy to be home'. (9NEWS) (9news)

He was acquitted of the charges in 2005, but pleaded guilty to threatening violence against Commonwealth officials and spent two-and-a-half years in prison.

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“There were also reports later that Mallah had travelled to Syria, and had expressed support for Al-Qaeda-affiliated terrorist groups and the Free Syrian Army,” the Home Affairs office spokesperson said.

In 2015, he was controversially allowed to ask a question on ABC's Q&A program which lead to a government review.